From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3C8B7CCD193 for ; Wed, 15 Oct 2025 21:31:53 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 33B998E003B; Wed, 15 Oct 2025 17:31:52 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3137C8E0027; Wed, 15 Oct 2025 17:31:52 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 229338E003B; Wed, 15 Oct 2025 17:31:52 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 11C608E0027 for ; Wed, 15 Oct 2025 17:31:52 -0400 (EDT) Received: from smtpin03.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id AEB2158FB1 for ; Wed, 15 Oct 2025 21:31:51 +0000 (UTC) X-FDA: 84001646022.03.72609BA Received: from mail-pl1-f176.google.com (mail-pl1-f176.google.com [209.85.214.176]) by imf05.hostedemail.com (Postfix) with ESMTP id C964610000C for ; Wed, 15 Oct 2025 21:31:49 +0000 (UTC) Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=gmail.com header.s=20230601 header.b=ACWj617Z; spf=pass (imf05.hostedemail.com: domain of sw.prabhu6@gmail.com designates 209.85.214.176 as permitted sender) smtp.mailfrom=sw.prabhu6@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1760563909; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=o41vuZjJtBNKQRqyuAm3WdKOiYyj4LMJ+UjhEIzRCo0=; b=nNJ+uf4N4g+M+p7ScqPwJ+g5QGKAfdXHqvWZpX2dU3dL5MF9owdSvFNzCCfsv3kfzEoR9v tLE+10JknKLJzEr4IIaNo80jVW/c7RSlRtzUjiKC7WzMn3pcknoCxSY8a9Wu8bpFa4Zx1U AeXikN/qFTEf8jydUhKskS+sZ68U6QU= ARC-Authentication-Results: i=1; imf05.hostedemail.com; dkim=pass header.d=gmail.com header.s=20230601 header.b=ACWj617Z; spf=pass (imf05.hostedemail.com: domain of sw.prabhu6@gmail.com designates 209.85.214.176 as permitted sender) smtp.mailfrom=sw.prabhu6@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1760563909; a=rsa-sha256; cv=none; b=OvxckpO7pKwGBIKuNjGdCNQpNL+9K3K8pGRCKQOg1z74/J3DT21VlpKQSwyewS7XAy7GdZ 3QIm+O8t04e8cucyqlgrqPbf49NREJNkfeJmpIro8IubCUJhqYTBIqiCo1cYVTjmJRC2gg uV1QOl+/Yr6g5JkHJ19jl/XJ+JboFGw= Received: by mail-pl1-f176.google.com with SMTP id d9443c01a7336-271d1305ad7so863335ad.2 for ; Wed, 15 Oct 2025 14:31:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1760563909; x=1761168709; darn=kvack.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=o41vuZjJtBNKQRqyuAm3WdKOiYyj4LMJ+UjhEIzRCo0=; b=ACWj617Z6yb6iH2xPDpskokzhjBHUBG63YAYBLaLWFf4Illz6DIMdHubDfroPdRfM/ gZO8b4DPvi/ASBEQiF4/3LTAb527Q2rd2si/hNttPAwyLYl7km4H00CLjh078byTyXbI cAdfuWeOV87asc6C1o10XFomKkoO0tFLRda+phzWqpqcob072OHKyZj0zW2yvdP8W8U7 19rMiT56rsMfO+kbCyNofCvGumui7LrwowJ44Y/2n1YfJFw7Yz3PyQjKe4YDurlXaelL Zxs9tXgWaGhTp8F8mz3yimqpTbNb/IUuodyNFA9uFwWAsXGA4TSUtX6R5gOnzIg7cKgX fZag== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1760563909; x=1761168709; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=o41vuZjJtBNKQRqyuAm3WdKOiYyj4LMJ+UjhEIzRCo0=; b=kOGCqJn3KrLsIH9Fl/XiOwsCYOKemW85BPqpLz8wbnfm6Pz+tBVXCl3KPesMu9MEap QF6+h4RecucEY7twADqb8CJMfoKrRwWRUH4KA9NowIso7HQ3qCKurh17z7tBju2t1TFJ larzarVNzhyngXGIpulftAembm85othgwbDULL6mbpcMHh52mIZcb0OFrEea1UbFWJIg Is+IcHW+DQsQO338qZVFweSC6Ll3aLrJVLCcZjBHKQeglAzaiZ5Xd7W9N8NZlgpAr1GA wRKa2xpIo53q0sU8LdOQ6ZQBNW87HDPpk5Cawqb4kybEuM8t0z/ZMg7cdQ2J8fElZyrw 4y5Q== X-Forwarded-Encrypted: i=1; AJvYcCVAN0zcULeIHzRFVR5YZQaAHegYPqlPejrBoLTGKM4lmNnL3tHOr5B79A8QrqZ7TVAKInvlhIsB2Q==@kvack.org X-Gm-Message-State: AOJu0YwVxGzGVXJVGxXeq4RpneDNrMiIdJn3R9b1rPxEdGeC/N9vxx4K ew74WkTQzDPCEDW05Ji/wnIWNfUhBG5YM8jNtBwq3oB7qRp15Fq6/ocj X-Gm-Gg: ASbGncv7lpiaK4q/mwYexH+gzXhKMmUbuEDuK9dfSucevKLS4zOtI3Qzv5t9SHzobyf I5s5XtiLoU98HhQYMxEUmYjH76wvYz1VadNkyPjJdHnVTicr9vDCFjFBmNdTBF0wVSxangdDlBT /S585Pk/CZqXZOzx8cIoj1dXR8t/HYihtJaNSLheIevt6KCjXqQDCecNMuVXZE5FPlDb7RzOYBW KgpKu9CrLB1WCPiftngVUk36G1Y7nYy5vB2T5cgQc9SeVPGmR7/h4m1+Niq4Bzf/gqpKK3TySiw 07T62U2DQ+32JAVGvsy+qKdTq0oi3N/SXUXu/U+tKCGo20Qj9x1xsb1zAHnTEK4a9ePpsKK4h32 FevIdenFjtBK8xHUSZsqP/zjt/tVBF4PFN9yXAyJnP0He4sv8Bc0ruTcjuii+PRpJsELAgJselp +40EuvBIpa7yZnVhOzZrVOxJMFBl33qLx06PX7 X-Google-Smtp-Source: AGHT+IGLK2KNCFy9yJ+ADGHoDXWEeD5vBSwlRiksZRTqduHXWjG/eR8aCqJMbVLWcmpfhZzSaXvxZw== X-Received: by 2002:a17:902:c94c:b0:27e:f201:ec94 with SMTP id d9443c01a7336-29027373e8cmr428236025ad.18.1760563908494; Wed, 15 Oct 2025 14:31:48 -0700 (PDT) Received: from deb-101020-bm01.eng.stellus.in ([149.97.161.244]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29099abdaa3sm6039635ad.94.2025.10.15.14.31.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Oct 2025 14:31:48 -0700 (PDT) Date: Wed, 15 Oct 2025 21:31:46 +0000 From: Swarna Prabhu To: Linus Torvalds , kirill@shutemov.name, tytso@mit.edu Cc: Matthew Wilcox , Linux-MM , Swarna Prabhu , Pankaj Raghav , Devasena Inupakutika , Luis Chamberlain , dave@stgolabs.net Subject: Re: Optimizing small reads Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: C964610000C X-Rspamd-Server: rspam11 X-Rspam-User: X-Stat-Signature: xifunnf5hdxinr5bgd6sd7m4um76hs3k X-HE-Tag: 1760563909-750014 X-HE-Meta: U2FsdGVkX18tE7QP1rjagXSdM9/H76G0QAuzuaOUFvlrnOAHLDjcIPIwz9JnZuDbHlZJM01uVXApZ0XBsBfQWLD7B4KyragdOUvvCuTVTiVmbD14FGOe1Pafuu95ye52W7CWVHWu30rjPT7OOgpQjRuOy82uqi/1DgwLMz426aNh+nG8EqwJTXhKxDeTyZJwjfAPGn0ZxrGYa9gITycHr45BHYC9ci7Di61TObIlgZ27RsC9BkwjMNnha3uuMipwbFm5QaRZ4qRFSLuw4r0DSKNFkfIq7lL/9BlRfqqGv5xKa/nqT8pdZWCUUCCDsBHl+Gx4I0VSaVRCuqzZ9sBuvnbLTuOvjmAAcVCuOgR2zY9mKNMgwjbFOihpp3k86+KdMmntpgs4SAIaVqXEU3wpn+gxV2/xntu6IKW1rRcZ7kINZV+k7amVFD7Q6pU7TjAKg86ZRsoysPC1H4+csj6BbJ7gTTEo5oGcRfRcDLR2/gdZHgmoRX7zOiAWIwh5hNTA/5P5ijx8HZhtP5OlidKTsnWl46Sipha4wzHXweX+0pS2cYPiK2O66E77cTtMF+5uN56D4lJ+5ePTPORqPSF+COCRt1MZGWQ8rVFr9+tZ+QqHUMJOUMMkLjdGKBHM6Ez3WIsgfYxdRxogvH1SYC+uQpi8HIWIBaNUsnxRnnGjs7O5wgPyVogZo9ZrS62SQfKSZjI2ZOR5tuZwyn6uMPqwuFm7dtFqWAcHm3RgykJVg0oUJzbov0EAr2hrj8Y+7gTvF1eZoXOpsEpWgyDJXeR82uPzLU9MsTBOgLn1WTbenozr3VxViMMni+JG8aevQRzlCLkHW/K7OKrruYj4M8uPW9xylTJo1neAaY9xinQp+XFWXacC9jpbsBVbstrhBbvnCy0xN4IT1JNvJCrs80X2Wk7qWICe489v5sH0iPMd/FrDKEm4aX8sg7bK11nMug0dGmFoXLGTwj7+Z2ZWmTv AQJgZL15 6moiHw54xpXjHWOx4D7FgJowlVkwaefwtrr+td60QJB0jTBUEMkFCu2E0Ouo7CxDL9nvi0+2ElC1WCr7qPw3Tqmx5tRNUD0U6MO5uYcIEpOvUYG7Lvypm/y5G1QxivNnL/u1hI7RWeAvofA2CXeyLFm9XKIAPc1gdyJSK1a1iEox1HPMNIKNqiLKpR2jkKnpdPM69Dcf2O8m0LoA+JQiY4NKuc1h+G91zU1X5WNfaOKTjKCHF/i0khXn3TLK52IUDzbYyvHczS2VPxvioOuRYMt5zu4f1mSeNyDWY3vahf8erZLAd+++nBbZiGCcWPMsGRW8ycOwu/UOE0sMQFVtKJIOVQPVt+oy/GbdFN7QL/aEvsm9FM6hvG9E2EP81WUhIyqAUhdPztmJ8BtzOUDrT26mkZ4tpomA4iMeINrevggaR34RXdSkyUcYvUAXIWjcHgO+E X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Oct 02, 2025 at 08:32:42PM -0700, Luis Chamberlain wrote: > However since there was no *rush* I figured its a nice candidate effort > to get someone new to hack on the kernel. So give us a bit of time and > will surely justify its merit with a clear workload, and with a thorough > dig why its failing on the above. The original patch was showing regressions on kdevops xfs_reflink_4k profile for generic/095 and generic/741. I tested the same patch and the regressions reported earlier is no longer seen. Further testing with different profiles and Kirill's latest patch is under progress. Swarna